有機染料及其在P型染敏太陽能電池之開發與研究

Abstract

此論文合成一系列結構中含有羧酸根—共軛架橋(conjugated spacer)—電子予體(donor)—共軛架橋—電子受體(acceptor)且具有不同的共軛架橋或是電子受體之染料(PT系列)，並應用於P型染敏電池中，其中羧酸根可架接於光電極NiO。染料結構的改變對於光物理、電化學以性質及光電轉換效率皆有顯著的影響。當染料結構具有兩個anchoring groups時，有助於電洞之注入NiO以及壓抑暗電流，使得Voc與Jsc值都較其他PT染料來的大。另外，本研究也進行了暗電流元件阻抗(EIS)的量測來印證元件效率之表現。P型染敏電池所呈現的光電轉換效率範圍為0.043−0.081%。在相同的條件下與標準品S (4-(bis(4-(5-(2,2-dicyanovinyl)thiophen-2-yl)phenyl)amino)benzoic acid)製成的元件比較，PT元件效率可達標準元件效率的49−92%。A series of dyes (PT) with a carboxylic acid-conjugated spacer-donor-conjugated space-acceptor skeleton have been synthesized and used as the sensitizer for p-type dye-sensitized solar cells (DSSCs). Structural variation of the dye has significant influence on the photophysical and electrochemical properties of the dyes, and the incident photon-to-current conversion efficiencies of the DSSCs. DSSCs based on the sensitizers with two anchoring groups have more efficient hole injection and less dark current, and therefore higher Voc and Jscvalues those based on the dyes with only one anchoring group. Dark current and electrochemical impedance spectroscopy (ESI) were measured to rationalize the cell efficiencies. The efficiencies of the p-type devices based on PT series range from 0.043% to 0.081%. These values reach 49−92% of the standard device based on S(4-(bis(4-(5-(2,2-dicyanovinyl)thiophen-2-yl)phenyl)amino)benzoic acid) fabricated and measured under similar conditions.